Impetus is a power of the mover applied in a movable thing which causes the movable thing to move after it is separated from its mover. - Leonardo da Vinci

The East will be seen to rush to the West and the South to the North in confusion round and about the universe, with great noise and trembling or fury.

I know that there are numberless people who would, to satisfy a whim, destroy God and all the universe.

They will say that I, having no literary skill, cannot properly express that which I desire to treat of, but they do not know that my subjects are to be dealt with by experience rather than by words. And [experience] has been the mistress of those who wrote well. And so, as mistress, I will cite her in all cases. Though I may not, like them, be able to quote other authors, I shall rely on that which is much greater and more worthy: on experience, the mistress of their masters.